Dusk on the Heath: A Shift in Gear

Lowland heathland is rarer than rainforest, and the UK holds a sizeable share of the world's total. Sit quietly on a heather bank as the light drains away and you'll understand why it deserves that status. The daytime cast — stonechats, silver-studded blues, darting lizards — clocks off, and a different shift arrives. Night-scented flowers open, moths lift off the heather, and bats begin working the rides and edges with a purpose that is thrilling to watch.

The good news is that you need very little equipment and no special permission to enjoy this, provided you go about it gently. The techniques below are designed to put moths and bats in front of you while leaving the habitat as undisturbed as you found it.

Meeting the Moths

Heathland moths are wonderfully varied, and several are specialists you won't easily see elsewhere. On a mild May evening, male emperor moths quarter the heather in fast, weaving flight, following the scent of a freshly emerged female. Later in summer look for fox moth and drinker caterpillars on the move, and adults of the oak eggar and the appropriately named heath rustic. Add the countless "micros" — small, intricately marked species that specialists still argue over — and a single evening can turn up dozens of species.

Two low-impact ways to find them:

• Sugaring. Paint a mixture of dark sugar, a splash of beer or ale and a little mashed banana onto fence posts and tree trunks along a ride before dusk. Return with a dim torch an hour later and check the patches.
• Torch-and-sheet. Hang a pale cotton sheet between two posts and sweep it gently with a low-output beam. Moths settle on the fabric and can be admired and released without handling.

Both methods leave the habitat untouched. Avoid running bright mercury-vapour traps on sensitive sites — they pull insects from a wide area and can be genuinely damaging on small, fragmented heaths.

How to Watch Moths Without Flooding the Place with Light

White light is the enemy of a good night's watching. It wrecks your night vision, disturbs bats, and disorientates moths so thoroughly that they circle a lamp until exhausted. Keep to these habits and you'll see more, not less:

• Use a red filter or a torch with a red setting, and keep output low.
• Hold the beam off to one side of the insect rather than directly on it.
• Give your eyes twenty minutes to adapt, then rely on ambient starlight where you can.
• Check sugar patches quickly, then switch off and move on.
• Never handle moths. A moth's wing scales are easily rubbed away, and warm hands do real harm.

Bats: The Night Shift Hunters

Heathland is superb bat country. The open heather and scattered birch and pine create sheltered edges where insects gather, and the rides act as flight lines. Expect common and soprano pipistrelles first, flitting fast and low along the treelines, their echolocation clicks audible on a detector as rapid smacks around 45 kHz and 55 kHz respectively. Higher and more leisurely, noctules patrol above the canopy — one of our largest bats, and often the first to appear while the sky is still blue.

Denser cover rewards patience: brown long-eared bats glean insects from foliage and can hover almost like kestrels, while barbastelles hunt the woodland edge with a quiet, cryptic call that's hard to pick up on cheaper detectors. If there's a stream or pond nearby, watch the water surface for Daubenton's bats skimming low and taking insects from the meniscus.

An inexpensive heterodyne bat detector is the single best purchase you can make. Sweep slowly through the frequency range and note what you hear, when, and where — that's how real records get built.

Kit, Timing and Safe Practice

Warm, still, humid nights are best. Below about 10°C, or in a stiff breeze, activity collapses and you'll be standing in the dark for nothing. A good window runs from about half an hour before sunset to two hours after; some sites come alive again just before dawn.

• Clothing: long trousers tucked into socks, sturdy boots, a midge head-net in July and August. Adders are abroad at dusk — stay on paths and keep dogs close.
• Lighting: a red-filtered head torch plus a small hand torch, spare batteries, and a soft red bike light for the walk back.
• Ground rules: no netting, no trapping, no playback of nightjar song, and no leaving the path across fragile lichen and nesting habitat. If a bird churrs at you in May or June, you've drifted too close to a nightjar — back away quietly.
• Permission: many heaths are nature reserves, commons or private land. Check access rules and stick to them.

Giving Something Back

The pleasure of a heath at night is doubled by knowing your sightings count. Jot down species, numbers, grid reference and conditions, then send them to your county moth recorder or local bat recording scheme. Those records inform how the site is managed — where grazing is needed, where scrub should be cut back, where lighting should stay off. Keep a thermos in the car, leave the site as you found it, and you'll have earned your next visit. The heath needs watchers who care; quietly, with a red torch and a notebook, you've just become one.